Opening die.



. PATBNTED LMAY 14, 1907.

H.}H. WELSH, JR.

OPENING DIE.

APPLIoATIoN FILED un 1s, 19o1.

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Anvil No. 853,289. 4 -PATENTED MAY'14,`1907. H. H. WELSH, JR. OPENINGDIE.

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HARVEY H. WELSH, JR., OF WILMERDING, PENNSYLVANIA, ASSIGNOR TO THEWESTINGHOUSE AIR BRAKE COMPANY, OF

PITTSBURG, PENNSYL- VANIA, A CORPORATION OF PENNSYLVANIA.

OPENING DIE.

Speccation of Letters Patent.

Patented May 14, 1907.

Application tiled May 18, 1901. Serial No. 60,837,

To all whom it may concern: p

Be it known that I, HARVEY' H. WELSH, J r., a citizen of the UnitedStates, residing at Wilmerding, county of Allegheny, State ofPennsylvania, have invented or discovered a certain new and usefulImprovement in Opening Dies, of which improvement the following is aspecification.

iVly invention relates to dies for cutting threads upon bolts, screwplugs, caps, and the like, and has for its object to provide a die whichmay be quickly opened and closed.

My invention consists in an improved construction of die having movableslides for carrying the cutting dies and means whereby the slides may bemoved toward or from each other in order to open or close the die.

In the accompanying drawings, which illustrate an embodiment of myinvention, Figure 1 is a vertical section of my improved die taken onthe line 2-2 of Fig. 2; Fig. 2 is a horizontal section taken on the line-:z: of Fig. 1, Fig. 3 is a vertical central section taken at rightangles to Fig. l; Fig. 4 is a plan view of the die body with the slidesremoved; Fig. 5 is a side elevation of my improved die complete Fig. 6is a plan view of the two slides carrying the cutting dies, the slotcovers being removed Fig. 7 is a plan viewof the cam ring for operatingthe levers; Fig. 8 is a section of a portion of one oi the slides, takenon the line y-y of Fig. 6, and Fig. 9 is a side view of one of thecutting dies showing the groove therein.

The die-body 1 is made of cast iron and is substantially cylindrical inform, having two segmental cut-away portions forming two plane faces onopposite sides of the body. The die-body 1 is mounted in position in alathe or other machine where it is to be operated, by means of a shank2, which is secured to the bottom of the body portion. The upper face ofthe die-body is provided with two parallel gibs or guides 3 on which theslides 4 are adapted to be moved. In the rounded sides of the die ibodyare vertical slots 5 which extend the entire length of the body portionand in these slots the levers 6 are pivoted by means of bolts 8. Theupper ends of the levers 6 extend into slots 9 in the slides 4 while thelower ends of these levers are adapted to engage with the surface of acam ring or collar 7, which is mounted to the recesses 15.

turn upon the shank 2. Through the center of the die body there is anopening 14 in which is located a spiral spring 10. The two slides 4 havestuds 12 secured therein, the heads of which extend down through slots13 into the opening 14. At the ends of the spring l0 are thirnbles 11which bear against the studs 12, and in this way the two slides 4 areforced in opposite directions against the upper ends of the levers 6.When the cam ring is turned so that the two recesses 15 in the face ofthe cam ring are in line with the lower ends of the levers 6 the springwill force the two slides 4 apart and the lower ends of the levers willdrop into Then by a further turn of the cam ring the lower ends of thelevers will be forced out by the cam surfaces 16 and the spring 10 willbe compressed. 1

A semi-cylindrical portion of each slide 4 is out away to form a centralcircular opening 17. The slides are also provided with 'radial slots 18,in. which are located the cutting-dies 19. These cutting-dies areadjustable toward and from the center by means of screws 20, which aretapped into the outer ends of the radial slots. After being adjusted tothe proper position the cutting-dies 19 are securely clamped by theconical wedges 21 and screws 22. The conical wedges are located in holes23 in the upper face of the slides 4, close to the radial slots 18 andthe cutting-dies 19 are provided with longitudinal grooves 25 into whichthe conical wedges project, as shown in Fig. 8. The groove has aninclined surface, which corresponds with the conical surface of thewedge so that, as the wedge is screwed down the cutting-die is forcedagainst the other side of the radial slot and securely held.

Thin plates or covers 24 are provided for f the top of the openings orslots 9 in the slides to keep out the dirt and other matter which mightinterfere with the operation of the levers.

The cutting-dies being properly adjusted by screws 20 and securelyclamped in position by the conical wedges 21, the handle of the cam ring7 maybe turned so that the lower ends of the levers 6 drop into theslots or recesses 15, and the spring. 1() forces the two slides 4 apart,thus opening the die. The Work may then be placed in position in the IOOlathe or other machine 'and the die closed by giving the cam ringanother quarter turn, which moves the lower ends of the levers outwardand forces the two slides, carrying the cutting-dies, inward to theiroperating posi tion. It will thus be seen that the operation is verysimple and the die may be quickly and easily opened or closed by a merequarter turn of the handle of the cam ring.

My invention is not limited to thel exact construction shown, as certainchanges of form and arrangement of parts may be made without departingtherefrom.

I/Vhat I claim and desire to secure by Letters Patent is 1. In anopening-die, the combination with a die-body having levers pivotedthereto, of movable slides engaged by the levers and mounted toreciprocate on saiddie-body,

a spring located in an opening in the die zo with a die-body havingguides and recipro- 2 5 eating slides mounted therein, of levers pivotedto said die-body with one of their ends bearing against the slides,studs secured to said slides, a spring located between said studs, and acam ring rotatably mounted on 3o the die-body and engaging the otherends oi' said levers. i

In testimony whereof, I have hereunto set H. H. WELSH, JR. Witnesses E.F. WRIGHT, R. V. EMERY.

I vmy hand.

